package com.hmdp.interceptor;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.redis.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.redis.RedisConstants.LOGIN_USER_TTL;

/**
 * 登录拦截器
 *
 * @author: 默苍璃
 * @date: 2025-04-27 23:39
 */
public class LoginInterceptor implements HandlerInterceptor {


    private StringRedisTemplate stringRedisTemplate;

    //public LoginInterceptor(StringRedisTemplate stringRedisTemplate) {
    //    this.stringRedisTemplate = stringRedisTemplate;
    //}
    //

    /**
     * 保存数据到session
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle1(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取session
        HttpSession session = request.getSession();
        // 获取用户信息
        Object user = session.getAttribute("user");

        if (user == null) {
            //未登录，返回401
            response.setStatus(401);
            return false;
        }

        UserHolder.saveUser((UserDTO) user);

        return true;
    }


    /**
     * 保存数据到redis
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle2(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }
        // 2.基于TOKEN获取redis中的用户
        String key = LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);
        // 3.判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }
        // 5.将查询到的hash数据转为UserDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        // 6.存在，保存用户信息到 ThreadLocal
        UserHolder.saveUser(userDTO);
        // 7.刷新token有效期
        stringRedisTemplate.expire(key, LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 8.放行
        return true;
    }


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.判断是否需要拦截（ThreadLocal中是否有用户）
        if (UserHolder.getUser() == null) {
            // 没有，需要拦截，设置状态码
            response.setStatus(401);
            // 拦截
            return false;
        }
        // 有用户，则放行
        return true;
    }


    public void afterCompletion1(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户
        UserHolder.removeUser();
    }


}
